An object experiences a constant acceleration of +2m/s2 from t=0 to t=4s and then moves with zero acceleration for the next 4s. The object starts from rest at t=0. Which of the following velocity–time graphs best represents the motion?
(a) Velocity increases quadratically from 0m/s at t=0 to 32m/s at t=4s, and then stays constant at 32m/s through t=8s.},{
(b) Velocity increases linearly from 0m/s at t=0 to 8m/s at t=4s, and then remains constant at 8m/s until t=8s.},{
(c) Velocity increases linearly from 0m/s at t=0 to 8m/s at t=4s, and then decreases linearly back to 0m/s by t=8s.},{
(d) Velocity increases linearly from 0m/s at t=0 to 16m/s at t=8s.} ],